點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC

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3-CHANNEL CONSTANT CURRENT LED DRIVERS

Version:A.003

Page 9

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DM412

Input Data Format

LED Open Detection

DM412 provides a real time monitor of LED open detection function without extra components

or circuit design. It will be identified as a LED open failure when the output is turned on but the

output voltage is below 0.3V. The test result of each channel will write to its correspondent shift

register which is in LSB position (R[0], G[0], B[0]) while strobe signal is active. User can refer to

timing diagram on page12. Detecting report could be retrieved from serial-out (DAO) data. If the

system reads ‘1’ back, that indicates LED is in normal status. But if ‘0’ was retrieved then LED

open failure has occurred. In order to make sure LED open detection function is in well operating

condition, it is recommended that all the luminance data are wrote to ‘1’ then almost turning on the

outputs during detection process.

Serial-out Data Format